Kev Mann / mbed-dev-OS5_10_4

RTC auf true

features/mbedtls/src/x509write_csr.c@2:7aab896b1a3b, 2019-03-13 (annotated)

Committer:
kevman
Date:
Wed Mar 13 11:03:24 2019 +0000
Revision:
2:7aab896b1a3b
Parent:
0:38ceb79fef03 
2019-03-13

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kevman 0:38ceb79fef03 1 /*
kevman 0:38ceb79fef03 2 * X.509 Certificate Signing Request writing
kevman 0:38ceb79fef03 3 *
kevman 0:38ceb79fef03 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
kevman 0:38ceb79fef03 5 * SPDX-License-Identifier: Apache-2.0
kevman 0:38ceb79fef03 6 *
kevman 0:38ceb79fef03 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
kevman 0:38ceb79fef03 8 * not use this file except in compliance with the License.
kevman 0:38ceb79fef03 9 * You may obtain a copy of the License at
kevman 0:38ceb79fef03 10 *
kevman 0:38ceb79fef03 11 * http://www.apache.org/licenses/LICENSE-2.0
kevman 0:38ceb79fef03 12 *
kevman 0:38ceb79fef03 13 * Unless required by applicable law or agreed to in writing, software
kevman 0:38ceb79fef03 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
kevman 0:38ceb79fef03 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
kevman 0:38ceb79fef03 16 * See the License for the specific language governing permissions and
kevman 0:38ceb79fef03 17 * limitations under the License.
kevman 0:38ceb79fef03 18 *
kevman 0:38ceb79fef03 19 * This file is part of mbed TLS (https://tls.mbed.org)
kevman 0:38ceb79fef03 20 */
kevman 0:38ceb79fef03 21 /*
kevman 0:38ceb79fef03 22 * References:
kevman 0:38ceb79fef03 23 * - CSRs: PKCS#10 v1.7 aka RFC 2986
kevman 0:38ceb79fef03 24 * - attributes: PKCS#9 v2.0 aka RFC 2985
kevman 0:38ceb79fef03 25 */
kevman 0:38ceb79fef03 26
kevman 0:38ceb79fef03 27 #if !defined(MBEDTLS_CONFIG_FILE)
kevman 0:38ceb79fef03 28 #include "mbedtls/config.h"
kevman 0:38ceb79fef03 29 #else
kevman 0:38ceb79fef03 30 #include MBEDTLS_CONFIG_FILE
kevman 0:38ceb79fef03 31 #endif
kevman 0:38ceb79fef03 32
kevman 0:38ceb79fef03 33 #if defined(MBEDTLS_X509_CSR_WRITE_C)
kevman 0:38ceb79fef03 34
kevman 0:38ceb79fef03 35 #include "mbedtls/x509_csr.h"
kevman 0:38ceb79fef03 36 #include "mbedtls/oid.h"
kevman 0:38ceb79fef03 37 #include "mbedtls/asn1write.h"
kevman 0:38ceb79fef03 38 #include "mbedtls/platform_util.h"
kevman 0:38ceb79fef03 39
kevman 0:38ceb79fef03 40 #include <string.h>
kevman 0:38ceb79fef03 41 #include <stdlib.h>
kevman 0:38ceb79fef03 42
kevman 0:38ceb79fef03 43 #if defined(MBEDTLS_PEM_WRITE_C)
kevman 0:38ceb79fef03 44 #include "mbedtls/pem.h"
kevman 0:38ceb79fef03 45 #endif
kevman 0:38ceb79fef03 46
kevman 0:38ceb79fef03 47 void mbedtls_x509write_csr_init( mbedtls_x509write_csr *ctx )
kevman 0:38ceb79fef03 48 {
kevman 0:38ceb79fef03 49 memset( ctx, 0, sizeof( mbedtls_x509write_csr ) );
kevman 0:38ceb79fef03 50 }
kevman 0:38ceb79fef03 51
kevman 0:38ceb79fef03 52 void mbedtls_x509write_csr_free( mbedtls_x509write_csr *ctx )
kevman 0:38ceb79fef03 53 {
kevman 0:38ceb79fef03 54 mbedtls_asn1_free_named_data_list( &ctx->subject );
kevman 0:38ceb79fef03 55 mbedtls_asn1_free_named_data_list( &ctx->extensions );
kevman 0:38ceb79fef03 56
kevman 0:38ceb79fef03 57 mbedtls_platform_zeroize( ctx, sizeof( mbedtls_x509write_csr ) );
kevman 0:38ceb79fef03 58 }
kevman 0:38ceb79fef03 59
kevman 0:38ceb79fef03 60 void mbedtls_x509write_csr_set_md_alg( mbedtls_x509write_csr *ctx, mbedtls_md_type_t md_alg )
kevman 0:38ceb79fef03 61 {
kevman 0:38ceb79fef03 62 ctx->md_alg = md_alg;
kevman 0:38ceb79fef03 63 }
kevman 0:38ceb79fef03 64
kevman 0:38ceb79fef03 65 void mbedtls_x509write_csr_set_key( mbedtls_x509write_csr *ctx, mbedtls_pk_context *key )
kevman 0:38ceb79fef03 66 {
kevman 0:38ceb79fef03 67 ctx->key = key;
kevman 0:38ceb79fef03 68 }
kevman 0:38ceb79fef03 69
kevman 0:38ceb79fef03 70 int mbedtls_x509write_csr_set_subject_name( mbedtls_x509write_csr *ctx,
kevman 0:38ceb79fef03 71 const char *subject_name )
kevman 0:38ceb79fef03 72 {
kevman 0:38ceb79fef03 73 return mbedtls_x509_string_to_names( &ctx->subject, subject_name );
kevman 0:38ceb79fef03 74 }
kevman 0:38ceb79fef03 75
kevman 0:38ceb79fef03 76 int mbedtls_x509write_csr_set_extension( mbedtls_x509write_csr *ctx,
kevman 0:38ceb79fef03 77 const char *oid, size_t oid_len,
kevman 0:38ceb79fef03 78 const unsigned char *val, size_t val_len )
kevman 0:38ceb79fef03 79 {
kevman 0:38ceb79fef03 80 return mbedtls_x509_set_extension( &ctx->extensions, oid, oid_len,
kevman 0:38ceb79fef03 81 0, val, val_len );
kevman 0:38ceb79fef03 82 }
kevman 0:38ceb79fef03 83
kevman 0:38ceb79fef03 84 int mbedtls_x509write_csr_set_key_usage( mbedtls_x509write_csr *ctx, unsigned char key_usage )
kevman 0:38ceb79fef03 85 {
kevman 0:38ceb79fef03 86 unsigned char buf[4];
kevman 0:38ceb79fef03 87 unsigned char *c;
kevman 0:38ceb79fef03 88 int ret;
kevman 0:38ceb79fef03 89
kevman 0:38ceb79fef03 90 c = buf + 4;
kevman 0:38ceb79fef03 91
kevman 0:38ceb79fef03 92 if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &key_usage, 7 ) ) != 4 )
kevman 0:38ceb79fef03 93 return( ret );
kevman 0:38ceb79fef03 94
kevman 0:38ceb79fef03 95 ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_KEY_USAGE,
kevman 0:38ceb79fef03 96 MBEDTLS_OID_SIZE( MBEDTLS_OID_KEY_USAGE ),
kevman 0:38ceb79fef03 97 buf, 4 );
kevman 0:38ceb79fef03 98 if( ret != 0 )
kevman 0:38ceb79fef03 99 return( ret );
kevman 0:38ceb79fef03 100
kevman 0:38ceb79fef03 101 return( 0 );
kevman 0:38ceb79fef03 102 }
kevman 0:38ceb79fef03 103
kevman 0:38ceb79fef03 104 int mbedtls_x509write_csr_set_ns_cert_type( mbedtls_x509write_csr *ctx,
kevman 0:38ceb79fef03 105 unsigned char ns_cert_type )
kevman 0:38ceb79fef03 106 {
kevman 0:38ceb79fef03 107 unsigned char buf[4];
kevman 0:38ceb79fef03 108 unsigned char *c;
kevman 0:38ceb79fef03 109 int ret;
kevman 0:38ceb79fef03 110
kevman 0:38ceb79fef03 111 c = buf + 4;
kevman 0:38ceb79fef03 112
kevman 0:38ceb79fef03 113 if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &ns_cert_type, 8 ) ) != 4 )
kevman 0:38ceb79fef03 114 return( ret );
kevman 0:38ceb79fef03 115
kevman 0:38ceb79fef03 116 ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_NS_CERT_TYPE,
kevman 0:38ceb79fef03 117 MBEDTLS_OID_SIZE( MBEDTLS_OID_NS_CERT_TYPE ),
kevman 0:38ceb79fef03 118 buf, 4 );
kevman 0:38ceb79fef03 119 if( ret != 0 )
kevman 0:38ceb79fef03 120 return( ret );
kevman 0:38ceb79fef03 121
kevman 0:38ceb79fef03 122 return( 0 );
kevman 0:38ceb79fef03 123 }
kevman 0:38ceb79fef03 124
kevman 0:38ceb79fef03 125 int mbedtls_x509write_csr_der( mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size,
kevman 0:38ceb79fef03 126 int (*f_rng)(void *, unsigned char *, size_t),
kevman 0:38ceb79fef03 127 void *p_rng )
kevman 0:38ceb79fef03 128 {
kevman 0:38ceb79fef03 129 int ret;
kevman 0:38ceb79fef03 130 const char *sig_oid;
kevman 0:38ceb79fef03 131 size_t sig_oid_len = 0;
kevman 0:38ceb79fef03 132 unsigned char *c, *c2;
kevman 0:38ceb79fef03 133 unsigned char hash[64];
kevman 0:38ceb79fef03 134 unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
kevman 0:38ceb79fef03 135 unsigned char tmp_buf[2048];
kevman 0:38ceb79fef03 136 size_t pub_len = 0, sig_and_oid_len = 0, sig_len;
kevman 0:38ceb79fef03 137 size_t len = 0;
kevman 0:38ceb79fef03 138 mbedtls_pk_type_t pk_alg;
kevman 0:38ceb79fef03 139
kevman 0:38ceb79fef03 140 /*
kevman 0:38ceb79fef03 141 * Prepare data to be signed in tmp_buf
kevman 0:38ceb79fef03 142 */
kevman 0:38ceb79fef03 143 c = tmp_buf + sizeof( tmp_buf );
kevman 0:38ceb79fef03 144
kevman 0:38ceb79fef03 145 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_extensions( &c, tmp_buf, ctx->extensions ) );
kevman 0:38ceb79fef03 146
kevman 0:38ceb79fef03 147 if( len )
kevman 0:38ceb79fef03 148 {
kevman 0:38ceb79fef03 149 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
kevman 0:38ceb79fef03 150 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
kevman 0:38ceb79fef03 151 MBEDTLS_ASN1_SEQUENCE ) );
kevman 0:38ceb79fef03 152
kevman 0:38ceb79fef03 153 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
kevman 0:38ceb79fef03 154 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
kevman 0:38ceb79fef03 155 MBEDTLS_ASN1_SET ) );
kevman 0:38ceb79fef03 156
kevman 0:38ceb79fef03 157 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( &c, tmp_buf, MBEDTLS_OID_PKCS9_CSR_EXT_REQ,
kevman 0:38ceb79fef03 158 MBEDTLS_OID_SIZE( MBEDTLS_OID_PKCS9_CSR_EXT_REQ ) ) );
kevman 0:38ceb79fef03 159
kevman 0:38ceb79fef03 160 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
kevman 0:38ceb79fef03 161 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
kevman 0:38ceb79fef03 162 MBEDTLS_ASN1_SEQUENCE ) );
kevman 0:38ceb79fef03 163 }
kevman 0:38ceb79fef03 164
kevman 0:38ceb79fef03 165 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
kevman 0:38ceb79fef03 166 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
kevman 0:38ceb79fef03 167 MBEDTLS_ASN1_CONTEXT_SPECIFIC ) );
kevman 0:38ceb79fef03 168
kevman 0:38ceb79fef03 169 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_pk_write_pubkey_der( ctx->key,
kevman 0:38ceb79fef03 170 tmp_buf, c - tmp_buf ) );
kevman 0:38ceb79fef03 171 c -= pub_len;
kevman 0:38ceb79fef03 172 len += pub_len;
kevman 0:38ceb79fef03 173
kevman 0:38ceb79fef03 174 /*
kevman 0:38ceb79fef03 175 * Subject ::= Name
kevman 0:38ceb79fef03 176 */
kevman 0:38ceb79fef03 177 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_names( &c, tmp_buf, ctx->subject ) );
kevman 0:38ceb79fef03 178
kevman 0:38ceb79fef03 179 /*
kevman 0:38ceb79fef03 180 * Version ::= INTEGER { v1(0), v2(1), v3(2) }
kevman 0:38ceb79fef03 181 */
kevman 0:38ceb79fef03 182 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, tmp_buf, 0 ) );
kevman 0:38ceb79fef03 183
kevman 0:38ceb79fef03 184 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
kevman 0:38ceb79fef03 185 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
kevman 0:38ceb79fef03 186 MBEDTLS_ASN1_SEQUENCE ) );
kevman 0:38ceb79fef03 187
kevman 0:38ceb79fef03 188 /*
kevman 0:38ceb79fef03 189 * Prepare signature
kevman 0:38ceb79fef03 190 */
kevman 0:38ceb79fef03 191 mbedtls_md( mbedtls_md_info_from_type( ctx->md_alg ), c, len, hash );
kevman 0:38ceb79fef03 192
kevman 0:38ceb79fef03 193 if( ( ret = mbedtls_pk_sign( ctx->key, ctx->md_alg, hash, 0, sig, &sig_len,
kevman 0:38ceb79fef03 194 f_rng, p_rng ) ) != 0 )
kevman 0:38ceb79fef03 195 {
kevman 0:38ceb79fef03 196 return( ret );
kevman 0:38ceb79fef03 197 }
kevman 0:38ceb79fef03 198
kevman 0:38ceb79fef03 199 if( mbedtls_pk_can_do( ctx->key, MBEDTLS_PK_RSA ) )
kevman 0:38ceb79fef03 200 pk_alg = MBEDTLS_PK_RSA;
kevman 0:38ceb79fef03 201 else if( mbedtls_pk_can_do( ctx->key, MBEDTLS_PK_ECDSA ) )
kevman 0:38ceb79fef03 202 pk_alg = MBEDTLS_PK_ECDSA;
kevman 0:38ceb79fef03 203 else
kevman 0:38ceb79fef03 204 return( MBEDTLS_ERR_X509_INVALID_ALG );
kevman 0:38ceb79fef03 205
kevman 0:38ceb79fef03 206 if( ( ret = mbedtls_oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg,
kevman 0:38ceb79fef03 207 &sig_oid, &sig_oid_len ) ) != 0 )
kevman 0:38ceb79fef03 208 {
kevman 0:38ceb79fef03 209 return( ret );
kevman 0:38ceb79fef03 210 }
kevman 0:38ceb79fef03 211
kevman 0:38ceb79fef03 212 /*
kevman 0:38ceb79fef03 213 * Write data to output buffer
kevman 0:38ceb79fef03 214 */
kevman 0:38ceb79fef03 215 c2 = buf + size;
kevman 0:38ceb79fef03 216 MBEDTLS_ASN1_CHK_ADD( sig_and_oid_len, mbedtls_x509_write_sig( &c2, buf,
kevman 0:38ceb79fef03 217 sig_oid, sig_oid_len, sig, sig_len ) );
kevman 0:38ceb79fef03 218
kevman 0:38ceb79fef03 219 if( len > (size_t)( c2 - buf ) )
kevman 0:38ceb79fef03 220 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
kevman 0:38ceb79fef03 221
kevman 0:38ceb79fef03 222 c2 -= len;
kevman 0:38ceb79fef03 223 memcpy( c2, c, len );
kevman 0:38ceb79fef03 224
kevman 0:38ceb79fef03 225 len += sig_and_oid_len;
kevman 0:38ceb79fef03 226 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c2, buf, len ) );
kevman 0:38ceb79fef03 227 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c2, buf, MBEDTLS_ASN1_CONSTRUCTED |
kevman 0:38ceb79fef03 228 MBEDTLS_ASN1_SEQUENCE ) );
kevman 0:38ceb79fef03 229
kevman 0:38ceb79fef03 230 return( (int) len );
kevman 0:38ceb79fef03 231 }
kevman 0:38ceb79fef03 232
kevman 0:38ceb79fef03 233 #define PEM_BEGIN_CSR "-----BEGIN CERTIFICATE REQUEST-----\n"
kevman 0:38ceb79fef03 234 #define PEM_END_CSR "-----END CERTIFICATE REQUEST-----\n"
kevman 0:38ceb79fef03 235
kevman 0:38ceb79fef03 236 #if defined(MBEDTLS_PEM_WRITE_C)
kevman 0:38ceb79fef03 237 int mbedtls_x509write_csr_pem( mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size,
kevman 0:38ceb79fef03 238 int (*f_rng)(void *, unsigned char *, size_t),
kevman 0:38ceb79fef03 239 void *p_rng )
kevman 0:38ceb79fef03 240 {
kevman 0:38ceb79fef03 241 int ret;
kevman 0:38ceb79fef03 242 unsigned char output_buf[4096];
kevman 0:38ceb79fef03 243 size_t olen = 0;
kevman 0:38ceb79fef03 244
kevman 0:38ceb79fef03 245 if( ( ret = mbedtls_x509write_csr_der( ctx, output_buf, sizeof(output_buf),
kevman 0:38ceb79fef03 246 f_rng, p_rng ) ) < 0 )
kevman 0:38ceb79fef03 247 {
kevman 0:38ceb79fef03 248 return( ret );
kevman 0:38ceb79fef03 249 }
kevman 0:38ceb79fef03 250
kevman 0:38ceb79fef03 251 if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_CSR, PEM_END_CSR,
kevman 0:38ceb79fef03 252 output_buf + sizeof(output_buf) - ret,
kevman 0:38ceb79fef03 253 ret, buf, size, &olen ) ) != 0 )
kevman 0:38ceb79fef03 254 {
kevman 0:38ceb79fef03 255 return( ret );
kevman 0:38ceb79fef03 256 }
kevman 0:38ceb79fef03 257
kevman 0:38ceb79fef03 258 return( 0 );
kevman 0:38ceb79fef03 259 }
kevman 0:38ceb79fef03 260 #endif /* MBEDTLS_PEM_WRITE_C */
kevman 0:38ceb79fef03 261
kevman 0:38ceb79fef03 262 #endif /* MBEDTLS_X509_CSR_WRITE_C */